The inspection division of the Measures Department in a public service is interested in estimating the actual amount of soft drink that is placed in 2 -liter bottles at the local bottling plant of a large nationally known soft-drink company. The bottling plant has informed the inspection division that the standard deviation for

1. The Environmental Protection Agency (EPA) fuel economy estimates for automobiles tested recently predicted
a mean of 24.8 mpg with a standard deviation of 6.2 mpg for highway driving. Assume that the data is normally distributed. Using the 68-95-99.7 Rule, Determine:
a. Within what interval you would expect the middle

Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, Mr. McWhinney gathered the following sample information. The X column indicates the number of client contacts last month, and the Y

Does marriage hinder the career progression of women to a greater degree than that of men? According to The Journal of Applied Psychology, in a random sample of 795 male managers and 223 female managers from 20 Fortune 500 corporations, 86% of the male managers and 45% of the female managers were married.
-Use a 95% CI to es

ComputerWare asked 500 of its iMac purchasers what computer they owned or had owned. There were 83 new computer owners, 60 who had owned a Windows-based computer, and 357 who had owned a Macintosh. The proportion of first-time computer owners was 83/500 = 0.167. So, 0.167 is an estimate of the proportion of new computer owners.

Pulse rate is an important measure of the fitness of a person's cardiovascular system. The mean pulse rate for all U.S. adult males is approximately 72 heart beats per minute. A random sample of 21 U.S. male adults who jog at least 15 miles per week had a mean pulse rate of 52.6 beats per minute and a standard deviation of 3.22

16) If the random variable z is the standard normal distribution, then z(0.2324) =
23) Determine the minimum number of subjects to be polled for a survey with a margin of error of six percentage points and a confidence level of 95%
a.253 b.267 c.278 d.306 e.none of these
32)

See attached file.
a. Determine the .95 confidence interval, in thousands of kilowatt-hours, for the mean of all six-room homes.
b. Determine the .95 prediction interval, in thousands of kilowatt-hours, for a particular six-room home.
Number of Kilowatt-Hours Number of Kilowatt-Hours
Rooms (thousands) Rooms (thous

1. The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2 eggs per month.
a. What is the value of the population mean? What is the best estimate of this value?
b. Explain why we need to

1) Assume that the population proportions are to be estimated from the samples described. Find the margin of error and the 95% confidence interval.
Sample size = 256, sample proportion = 0.6
2) Importance: A Phone survey of 500 people revealed that 99% of those surveyed ranked good relationships as important or very import

Question: Give an estimate of the sample size needed to obtain the specified margin of error for a 95% confidence interval.
Margin of error = 0.01, standard deviation = 0.25
Scenario: Researchers want to determine the mean number of hours students spend watching TV. A margin of error of 0.25 hour is desired. Past studies

1) The distribution of sample mean for samples of 500 homes is normal with a mean of 2.64 and a standard deviation of 0.06. Suppose you select a random sample of n=500 homes and determine that the mean number of people per home for this sample id 2.55. How many standard deviations is the sample mean of the sampling distribution?

Please see attached.
1. For air travelers, one of the biggest complaints is of the waiting time between when the airplane taxis away from the terminal until the flight takes off. This waiting time is known to have a skewed-right distribution with a mean of 10 minutes and a standard deviation of 8 minutes. Suppose 100 flights ha

In the spring of 2002, residents of the United States were quite worried about the possibility of further terrorists attacks. To gauge the public's sentiment on this topic, the Gallup Poll asked 1002 U.S. adults the following question during May 20-22, 2002.
How likely is it that there will be further acts of terrorism in the

1) Does the M&M/Mars Corporation use the same proportion of red candies in its plain and peanut varieties? A random sample of 56 plains M&Ms contained 12 red candies, and another random sample of 32 peanut M&Ms contained 8 red candies.
a) Construct a 95% confidence interval for the difference in the proportions of red candies f

1) In an attempt to compare the starting salaries of college graduates majoring in education and social sciences, random samples of 50 recent college graduates in each major were selected and the attached information was obtained.
(see attachment for data table)
a) Find a point estimate for the difference in the average sta

Question: Do you have university education?
Yes=45% (n=450)
No=60% (n=800)
To find out whether 45% is significantly different from 60%, I use this:
=SQRT (45*(100-45)*1.96*1.96/450)
answer=4.59
Then I use
=SQRT(+60*(100-60)*1.96*1.96/800)
answer=3.40
Then I calculate the total margin of error

A poll of 1400 randomly selected students in grades 6 through 8 was conducted and found that 30% enjoy playing sports. Would confidence in the results increase if the sample size were 3200 instead of 1400? Why or why not?

1. A parcel service randomly selected 48 packages it received. The sample has a mean weight of 18.6 pounds. Assume that &#963; = 3.4 pounds. Construct a 90% confidence interval for the true mean weight, &#956;, of all packages received by the parcel service.
2. A phone company wants to estimate the mean duration of local

I have some trouble understanding the concept first and it will be really helpful if I can see the problem worked out. Here is example question from the textbook. Please help me.
The data studies the effect of dietary calcium on blood pressure. In the experiment, one group of black male adults received calcium supplements f

The mean and standard deviation of the sample of 65 customer satisfaction ratings are x-bar = 42.95 and s = 2.6424. If we let "mu" denote the mean of all possible customer satisfaction ratings:
a) Calculate 95 and 99 percent confidence intervals for "mu".
b) Using the 95 percent confidence interval, can we be 95% confident